CVE-2026-76271 Splunk CVE debrief

Who should care

Splunk Enterprise administrators and security teams should assess exposure and prioritize patching or applying workarounds. They should verify if Splunk Enterprise instances are running affected versions and monitor REST API endpoint logs for potential denial-of-service attempts. Additionally, they should restrict access to the REST API endpoint to minimize exposure and review compensating controls for exposed systems.

Why it matters

Defenders should care about CVE-2026-76271 because it allows low-privileged users to cause a denial of service against a REST API endpoint in the Discover Splunk Observability Cloud app for Splunk Enterprise. This vulnerability requires verification of affected versions, application of patches or workarounds, and monitoring of endpoint logs to minimize exposure and potential impact.

• Potential denial-of-service attacks against the REST API endpoint.
• Verification of affected versions and patch application priority.
• Monitoring of REST API endpoint logs for suspicious activity.
• Implementation of compensating controls to restrict access to the endpoint.

Technical summary

The Discover Splunk Observability Cloud app for Splunk Enterprise uses an inefficient regular expression to validate input submitted through a REST API endpoint. This allows a low-privileged user to cause a denial of service against the endpoint. Affected versions include Splunk Enterprise below 10.4.3, 10.2.7, and 10.0.10. The vulnerability requires verification of affected versions and application of patches or workarounds to minimize exposure and potential impact on the REST API endpoint's availability. The issue is specific to the Discover Splunk Observability Cloud app and does not affect other Splunk Enterprise components.

Defensive priority

Defenders should prioritize verifying affected versions and applying vendor patches or workarounds.

Recommended defensive actions

• Verify if Splunk Enterprise instances are running affected versions (below 10.4.3, 10.2.7, or 10.0.10).
• Apply patches or workarounds provided by Splunk for affected versions.
• Monitor REST API endpoint logs for potential denial-of-service attempts.
• Restrict access to the REST API endpoint to minimize exposure.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide details on the vulnerability, affected versions, and potential impact. However, additional information on exploitation or victim organizations is not available. The Discover Splunk Observability Cloud app for Splunk Enterprise uses an inefficient regular expression to validate input submitted through a REST API endpoint, allowing low-privileged users to cause a denial of service. The vulnerability affects Splunk Enterprise versions below 10.4.3, 10.2.7, and 10.0.10. There is no evidence of public

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.